Write a balanced net ionic equation for the reaction of nitric acid with insoluble copper(II) sulfide; the products include Cu^2+, S(s), and NO2(g).

Question

Write a balanced net ionic equation for the reaction of nitric acid with insoluble copper(II) sulfide; the products include [latex]Cu^{2+}[/latex], S(s), and [latex]NO_{2}[/latex](g).

STRATEGY

1. Recall the general procedure for writing and balancing redox equations from Chapter 17.
2. Note that [latex]HNO_{3}[/latex] is a strong acid, so it should be represented as [latex]H^+[/latex] and [latex]{NO_{3}}^{-}[/latex] ions.

Accepted Answer

Skeleton half-equations oxidation: [latex]CuS(s) \longrightarrow S(s)[/latex] reduction: [latex]{NO_{3}}^{-}(aq) \longrightarrow NO_2(g)[/latex]

Balanced half-reactions oxidation: [latex]CuS(s) \longrightarrow S(s) + Cu^{2+}(aq) + 2e^{-}[/latex]
reduction: [latex]{NO_{3}}^{-}(aq) + 2H^+(aq) + e^-(aq) \longrightarrow NO_2(g) + H_2O[/latex]

Overall reaction

[latex]\begin{matrix}\mathrm{CuS}(s) \longrightarrow \mathrm{ S(s)} + \mathrm{Cu^{2+}}(aq) + 2 e^- \quad \quad \quad \quad \quad \quad \\quad{2(\mathrm{{NO_{3}}^-}(a q)+2\mathrm{H^+}(aq)+ e^{-}}{ }\longrightarrow\mathrm{NO_2(g) +H_2O})\\hline\mathrm{CuS}(s)+2 \mathrm{{NO_{3}}^{-}}(a q) + 4H^+(aq) \longrightarrow\mathrm{Cu}^{2+}(aq)+\mathrm{S}(s) + 2NO_2(g) + 2H_2O \quad\quad\quad\quad\end{matrix} [/latex]

Question 21.9: Write a balanced net ionic equation for the reaction of nitr...

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